New version featuring:
* Fixed all implementation that assume 1-1 alignments;
* Deprecated accessor from the Alignment to the cell of an object;
* Implemented the deprecated with a compile-time tag;
* Implemented the Hungarian method for maximal pairing in building 1-1 alignments;
* Added equals() method to Cell and Relation;
* Added Precision-recall graph generators (GenPlot,PRGraphEvaluator);
* Computation of aggregated precision and recall rather than average (GroupEval);
* Added options for avoiding the alignment on some namespaces;
* Added timing in Procalign and Groupalign;
* Added extension mechnism for alignments (any extra-annotation stored).